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    <title>glActiveTexture - OpenGL ES 3 Reference Pages</title>
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    <div class="refentry" id="glActiveTexture">
      <div class="titlepage"/>
      <div class="refnamediv">
        <h2>Name</h2>
        <p>glActiveTexture — select active texture unit</p>
      </div>
      <div class="refsynopsisdiv">
        <h2>C Specification</h2>
        <div class="funcsynopsis">
          <table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
            <tr>
              <td>
                <code class="funcdef">void <strong class="fsfunc">glActiveTexture</strong>(</code>
              </td>
              <td>GLenum <var class="pdparam">texture</var><code>)</code>;</td>
            </tr>
          </table>
          <div class="funcprototype-spacer"> </div>
        </div>
      </div>
      <div class="refsect1" id="parameters">
        <h2>Parameters</h2>
        <div class="variablelist">
          <dl class="variablelist">
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>texture</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies which texture unit to make active. The number
                    of texture units is implementation-dependent, but must be at least
                    32. <em class="parameter"><code>texture</code></em> must be one of
                    <code class="constant">GL_TEXTURE</code><span class="emphasis"><em>i</em></span>,
                    where <span class="emphasis"><em>i</em></span> ranges from zero to the
                    value of
                    <code class="constant">GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS</code>
                    minus one. The initial value is
                    <code class="constant">GL_TEXTURE0</code>.
                </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1" id="description">
        <h2>Description</h2>
        <p>
            <code class="function">glActiveTexture</code> selects which texture unit subsequent texture state calls will
            affect.  The number of texture units an implementation supports is
            implementation-dependent, but must be at least 32.
        </p>
      </div>
      <div class="refsect1" id="errors">
        <h2>Errors</h2>
        <p>
            <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>texture</code></em> is not one of
            <code class="constant">GL_TEXTURE</code><span class="emphasis"><em>i</em></span>, where
            <span class="emphasis"><em>i</em></span> ranges from zero to the value of
            <code class="constant">GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS</code> minus
            one.
        </p>
      </div>
      <div class="refsect1" id="associatedgets">
        <h2>Associated Gets</h2>
        <p>
            <a class="citerefentry" href="glGet.xhtml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_ACTIVE_TEXTURE</code>, or <code class="constant">GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS</code>.
        </p>
      </div>
      <div class="refsect1" id="versions">
        <h2>API Version Support</h2>
        <div class="informaltable">
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                <th style="text-align: left; border-right: 2px solid ; ">
                 
            </th>
                <th style="text-align: center; border-bottom: 2px solid ; " colspan="2">
                <span class="bold"><strong>OpenGL ES API Version</strong></span>
            </th>
              </tr>
              <tr>
                <th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>Function Name</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>2.0</strong></span>
            </th>
                <th style="text-align: center; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.0</strong></span>
            </th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td style="text-align: left; border-right: 2px solid ; ">glActiveTexture</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; ">✔</td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>
      <div class="refsect1" id="seealso">
        <h2>See Also</h2>
        <p>
            <a class="citerefentry" href="glGenTextures.xhtml"><span class="citerefentry"><span class="refentrytitle">glGenTextures</span></span></a>,
            <a class="citerefentry" href="glBindTexture.xhtml"><span class="citerefentry"><span class="refentrytitle">glBindTexture</span></span></a>,
            <a class="citerefentry" href="glCompressedTexImage2D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexImage2D</span></span></a>,
            <a class="citerefentry" href="glCompressedTexImage3D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexImage3D</span></span></a>,
            <a class="citerefentry" href="glCompressedTexSubImage2D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexSubImage2D</span></span></a>,
            <a class="citerefentry" href="glCompressedTexSubImage3D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexSubImage3D</span></span></a>,
            <a class="citerefentry" href="glCopyTexImage2D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage2D</span></span></a>,
            <a class="citerefentry" href="glCopyTexSubImage2D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage2D</span></span></a>,
            <a class="citerefentry" href="glCopyTexSubImage3D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage3D</span></span></a>,
            <a class="citerefentry" href="glDeleteTextures.xhtml"><span class="citerefentry"><span class="refentrytitle">glDeleteTextures</span></span></a>
            <a class="citerefentry" href="glIsTexture.xhtml"><span class="citerefentry"><span class="refentrytitle">glIsTexture</span></span></a>,
            <a class="citerefentry" href="glTexImage2D.xhtml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>,
            <a class="citerefentry" href="glTexImage3D.xhtml"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a>,
            <a class="citerefentry" href="glTexSubImage2D.xhtml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage2D</span></span></a>,
            <a class="citerefentry" href="glTexSubImage3D.xhtml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage3D</span></span></a>,
            <a class="citerefentry" href="glTexParameter.xhtml"><span class="citerefentry"><span class="refentrytitle">glTexParameter</span></span></a>,
        </p>
      </div>
      <div class="refsect1" id="Copyright">
        <h2>Copyright</h2>
        <p>
            Copyright <span class="trademark"/>© 1991-2006 Silicon Graphics, Inc.
            Copyright <span class="trademark"/>© 2010-2014 Khronos Group.
            This document is licensed under the SGI Free Software B License.
            For details, see
            <a class="link" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
        </p>
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